Correlation of Sequences and Changes in Facies across Shelf Margin using Core and Seismic Data Offshore Canterbury basin

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Kachalla, Aliyuda
Kachalla, Aliyuda
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Kachalla
Kachalla
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Helen Lever
Helen Lever
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Musa Bappah Usman
Musa Bappah Usman
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Usman Abubakar
Usman Abubakar
α University of Aberdeen University of Aberdeen

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Correlation of Sequences and Changes in Facies across Shelf Margin using Core and Seismic Data Offshore Canterbury basin

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Abstract

Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting on the seismic profiles. From the interpretation, nineteen boundaries were identified (U1-U19), these boundaries can be broadly divided into two large units. From U19-U11 (the upper units), it’s dominated by downlapped seismic termination pattern along the paleoshelve and truncation surfaces across the shelve edge around site U1351B, a number of channel incisions were observed in this profile. The lower units (from U10-U5) consist of less truncation but more common onlap on paleoshelves, it features more drift deposits with sigmoidal reflection pattern.

References

13 Cites in Article
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  7. C Summary ; Fulthorpe,K Hoyanagi,P Blum the Expedition 317 Scientists, Proc. IODP.
  8. B Field,G Browne (1989). Cretaceous and Cenozoic sedimentary basins and geological evolution of Canterbury region, South Island, New Zealand: Chrischurch, New Zealand (DSIR).
  9. C Fulthorpe,R Carter (1991). Geological Society of America Bulletin Continental-shelf progradation by sediment-drift accretion.
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  11. M Laird,J Bradshaw (2004). The Break-up of a Long-term Relationship: the Cretaceous Separation of New Zealand from Gondwana.
  12. H Lu,C Fulthorpe (2004). Controls on sequence stratigraphy of a middle Miocene-Holocene, current-swept, passive margin: Offshore Canterbury Basin, New Zealand.
  13. R Sheriff,L Geldart (1983). Exploration Seismology Vol. 2: Data -Processing and Interpretation.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Kachalla, Aliyuda. 2018. \u201cCorrelation of Sequences and Changes in Facies across Shelf Margin using Core and Seismic Data Offshore Canterbury basin\u201d. Global Journal of Human-Social Science - B: Geography, Environmental Science & Disaster Management GJHSS-B Volume 18 (GJHSS Volume 18 Issue B3): .

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Issue Cover
GJHSS Volume 18 Issue B3
Pg. 17- 24
Journal Specifications

Crossref Journal DOI 10.17406/GJHSS

Print ISSN 0975-587X

e-ISSN 2249-460X

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GJHSS-B Classification: FOR Code: 040399
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v1.2

Issue date

August 16, 2018

Language
en
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Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting on the seismic profiles. From the interpretation, nineteen boundaries were identified (U1-U19), these boundaries can be broadly divided into two large units. From U19-U11 (the upper units), it’s dominated by downlapped seismic termination pattern along the paleoshelve and truncation surfaces across the shelve edge around site U1351B, a number of channel incisions were observed in this profile. The lower units (from U10-U5) consist of less truncation but more common onlap on paleoshelves, it features more drift deposits with sigmoidal reflection pattern.

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Correlation of Sequences and Changes in Facies across Shelf Margin using Core and Seismic Data Offshore Canterbury basin

Kachalla
Kachalla
Helen Lever
Helen Lever
Musa Bappah Usman
Musa Bappah Usman
Usman Abubakar
Usman Abubakar

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